現代圖書館目錄中書目關係之理論架構與連接機制有其重要性。本文探討目錄的書目單元、模式化編目規則之邏輯、圖書館目錄中之書目關係等。本文研究發現，書目關係於編目規則中詳加規範，並透過MARC等自動化編目設計，將可落實在圖書館目錄或線上檢索系統中，有助於讀者便捷查尋及檢索圖書資料。

The theoretical structure and linking device are important to the bibliographic relationships in the library catalog. This paper is to study the bibliographic unit of the library catalog, modeling the logic of cataloging rules, and various bibliographic relationships of the library catalog. This paper found out that regulating bibliographic relationships in the cataloging rules and implementation linking device in MARC format will make library information access and retrieval more efficient for the users in the library catalog or online database systems.